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[POWERPC] pseries: phyp dump: Register dump area

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Set up the actual dump header, register it with the hypervisor.

Signed-off-by: Manish Ahuja <mahuja@us.ibm.com>
Signed-off-by: Linas Vepstas <linasvepstas@gmail.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Manish Ahuja 2008-03-22 10:43:15 +11:00 committed by Paul Mackerras
parent d5a29c7a36
commit 2c4f41139c
1 changed files with 134 additions and 9 deletions
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143
arch/powerpc/platforms/pseries/phyp_dump.c
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@ -29,6 +29,117 @@
static struct phyp_dump phyp_dump_vars;
struct phyp_dump *phyp_dump_info = &phyp_dump_vars;
static int ibm_configure_kernel_dump;
/* ------------------------------------------------- */
/* RTAS interfaces to declare the dump regions */
struct dump_section {
u32 dump_flags;
u16 source_type;
u16 error_flags;
u64 source_address;
u64 source_length;
u64 length_copied;
u64 destination_address;
};
struct phyp_dump_header {
u32 version;
u16 num_of_sections;
u16 status;
u32 first_offset_section;
u32 dump_disk_section;
u64 block_num_dd;
u64 num_of_blocks_dd;
u32 offset_dd;
u32 maxtime_to_auto;
/* No dump disk path string used */
struct dump_section cpu_data;
struct dump_section hpte_data;
struct dump_section kernel_data;
};
/* The dump header *must be* in low memory, so .bss it */
static struct phyp_dump_header phdr;
#define NUM_DUMP_SECTIONS 3
#define DUMP_HEADER_VERSION 0x1
#define DUMP_REQUEST_FLAG 0x1
#define DUMP_SOURCE_CPU 0x0001
#define DUMP_SOURCE_HPTE 0x0002
#define DUMP_SOURCE_RMO 0x0011
/**
* init_dump_header() - initialize the header declaring a dump
* Returns: length of dump save area.
*
* When the hypervisor saves crashed state, it needs to put
* it somewhere. The dump header tells the hypervisor where
* the data can be saved.
*/
static unsigned long init_dump_header(struct phyp_dump_header *ph)
{
unsigned long addr_offset = 0;
/* Set up the dump header */
ph->version = DUMP_HEADER_VERSION;
ph->num_of_sections = NUM_DUMP_SECTIONS;
ph->status = 0;
ph->first_offset_section =
(u32)offsetof(struct phyp_dump_header, cpu_data);
ph->dump_disk_section = 0;
ph->block_num_dd = 0;
ph->num_of_blocks_dd = 0;
ph->offset_dd = 0;
ph->maxtime_to_auto = 0; /* disabled */
/* The first two sections are mandatory */
ph->cpu_data.dump_flags = DUMP_REQUEST_FLAG;
ph->cpu_data.source_type = DUMP_SOURCE_CPU;
ph->cpu_data.source_address = 0;
ph->cpu_data.source_length = phyp_dump_info->cpu_state_size;
ph->cpu_data.destination_address = addr_offset;
addr_offset += phyp_dump_info->cpu_state_size;
ph->hpte_data.dump_flags = DUMP_REQUEST_FLAG;
ph->hpte_data.source_type = DUMP_SOURCE_HPTE;
ph->hpte_data.source_address = 0;
ph->hpte_data.source_length = phyp_dump_info->hpte_region_size;
ph->hpte_data.destination_address = addr_offset;
addr_offset += phyp_dump_info->hpte_region_size;
/* This section describes the low kernel region */
ph->kernel_data.dump_flags = DUMP_REQUEST_FLAG;
ph->kernel_data.source_type = DUMP_SOURCE_RMO;
ph->kernel_data.source_address = PHYP_DUMP_RMR_START;
ph->kernel_data.source_length = PHYP_DUMP_RMR_END;
ph->kernel_data.destination_address = addr_offset;
addr_offset += ph->kernel_data.source_length;
return addr_offset;
}
static void register_dump_area(struct phyp_dump_header *ph, unsigned long addr)
{
int rc;
ph->cpu_data.destination_address += addr;
ph->hpte_data.destination_address += addr;
ph->kernel_data.destination_address += addr;
do {
rc = rtas_call(ibm_configure_kernel_dump, 3, 1, NULL,
1, ph, sizeof(struct phyp_dump_header));
} while (rtas_busy_delay(rc));
if (rc)
printk(KERN_ERR "phyp-dump: unexpected error (%d) on "
"register\n", rc);
}
/* ------------------------------------------------- */
/**
* release_memory_range -- release memory previously lmb_reserved
@ -107,7 +218,9 @@ static struct kobj_attribute rr = __ATTR(release_region, 0600,
static int __init phyp_dump_setup(void)
{
struct device_node *rtas;
const int *dump_header = NULL;
const struct phyp_dump_header *dump_header = NULL;
unsigned long dump_area_start;
unsigned long dump_area_length;
int header_len = 0;
int rc;
@ -119,7 +232,13 @@ static int __init phyp_dump_setup(void)
if (!phyp_dump_info->phyp_dump_configured)
return -ENOSYS;
/* Is there dump data waiting for us? */
/* Is there dump data waiting for us? If there isn't,
* then register a new dump area, and release all of
* the rest of the reserved ram.
*
* The /rtas/ibm,kernel-dump rtas node is present only
* if there is dump data waiting for us.
*/
rtas = of_find_node_by_path("/rtas");
if (rtas) {
dump_header = of_get_property(rtas, "ibm,kernel-dump",
@ -127,17 +246,23 @@ static int __init phyp_dump_setup(void)
of_node_put(rtas);
}
if (dump_header == NULL)
return 0;
dump_area_length = init_dump_header(&phdr);
/* Should we create a dump_subsys, analogous to s390/ipl.c ? */
rc = sysfs_create_file(kernel_kobj, &rr.attr);
if (rc) {
printk(KERN_ERR "phyp-dump: unable to create sysfs file (%d)\n",
rc);
/* align down */
dump_area_start = phyp_dump_info->init_reserve_start & PAGE_MASK;
if (dump_header == NULL) {
register_dump_area(&phdr, dump_area_start);
return 0;
}
/* Should we create a dump_subsys, analogous to s390/ipl.c ? */
rc = sysfs_create_file(kernel_kobj, &rr.attr);
if (rc)
printk(KERN_ERR "phyp-dump: unable to create sysfs file (%d)\n",
rc);
/* ToDo: re-register the dump area, for next time. */
return 0;
}
machine_subsys_initcall(pseries, phyp_dump_setup);